We’re all passionate about the preservation of internet history

Another valid point. According to the article, though:

If you still want to play old Flash games, look at the preserved websites that made the mistake of using Flash for their front page, and so on. They can continue to use the Flash binaries. The Flash files aren’t going away.
As for Flash-to-other-format conversion tools, they’ve been around for years. You can use Mozilla’s Shumway or, while Google no longer supports it, the Flash-to-HTML5 conversion tool Swiffy. There are many other Flash conversion programs available.
You don’t even need to open source it to create Flash files. In 2008, Adobe open-sourced its Flex framework, a software development kit for building Flash applications. Today, Flex lives on as an Apache Software Foundation project.

So what’s the difference with Ruffle? I’m not asking to provoke, I’m genuinely curious